柑橘黄化斑驳相关病毒（Citrus yellow mottle-associated virus，CiYMaV）属马铃薯X病毒属（Potexvirus）、印度柑橘病毒亚属（Mandarivirus），最早于2018年在巴基斯坦被发现，目前该病毒在巴基斯坦多地柑橘产区有发生。本研究首先借助植物双元表达载体pCass4-RZ构建了3个CiYMaV的全长cDNA克隆（pCiYMaV-FL-1、pCiYMaV-FL-18和pCiYMaV-FL-22），随后通过农杆菌真空浸润接种强德勒柚（Citrus grandis）验证其侵染活性。结果表明，在接种40-60天，3个克隆均引起严重的叶脉黄化、叶片斑驳和植株矮化的症状。直接组织点免疫（direct tissue blot immunoassay，DTBIA）和反转录聚合酶链式反应（reverse transcription polymerase chain reaction，RT-PCR）的检测结果表明3个克隆的侵染率为94.7-100%。尽管3个克隆引发的症状相似，pCiYMaV-FL-22在接种60天时，其在植株内的RNA和蛋白积累水平最高。因此，选择pCiYMaV-FL-22将其接种到7种柑橘和3种草本寄主上，结果表明pCiYMaV-FL-22能成功侵染7种柑橘寄主，并且在5个柑橘品种上引起明显症状。通过透射电镜，在接种pCiYMaV-FL-22的柑橘植株组织中观察到长线型、弯曲的病毒颗粒。综上所述，本研究构建了CiYMaV的全长感染性cDNA克隆，完成了该病毒的柯赫氏法则验证，为进一步研究该病毒侵染的分子机制和开发能应用于柑橘上的病毒载体奠定了基础。

Zinc (Zn) deficiency is widespread among citrus plants, but information about the mechanisms for Zn deficiency response in these plants is scarce. In the present study, different navel orange (Citrus sinensis (L.) Osbeck) leaves with various yellowing levels were sampled in our experimental orchard, and upon estimation of nutrient contents, Zn deficiencies were diagnosed as mild, moderate, and severe. Further analysis of chlorophyll content, photosynthetic characteristics, antioxidant enzyme activities, and expression levels of Zn/Iron-regulated transporter-like protein (ZIP) family genes were conducted in the sampled Zn-deficient leaves. The results showed that chlorophyll contents and net photosynthetic rate (P_n) seemed to decrease with reduced Zn contents. In addition, comparison of severe Zn-deficient and normal leaves revealed that activities of peroxidase (POD) and catalase (CAT) increased significantly, whereas that of Zn-containing enzymes such as Cu/Zn superoxide dismutase (Cu/Zn-SOD) significantly reduced with decreasing Zn contents. As expected, expression of the ZIP family genes, ZIP1, ZIP3, and ZIP4, was induced by Zn deficiencies. These results deepen our understanding of Zn deficiency in citrus plants as well as provide useful preliminary information for further research.